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A step down transformer converts transmi...

A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60%. If the output power is 9 kW, then the input power will be

A

11 kW

B

12 kW

C

14 kW

D

15 kW

Text Solution

Verified by Experts

The correct Answer is:
D
Here, `V_(p)=11000 V, V_(s)=220 V`
`N_(p) = 6000 eta, 60% , P_(o)=9 kW=9xx10^(3) W`
Efficiency, `eta = ("Output power")/("Input poers")=(P_(o))/(P_(i))`
`therefore P_(i)=(P_(o))/(eta)=(9xx10^(3))/(60//100)=1.5xx10^(4)=15 kW`
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